1 /* SPDX-License-Identifier: GPL-2.0 */
4 * Common functionality of grant device.
6 * Copyright (c) 2006-2007, D G Murray.
7 * (c) 2009 Gerd Hoffmann <kraxel@redhat.com>
8 * (c) 2018 Oleksandr Andrushchenko, EPAM Systems Inc.
11 #ifndef _GNTDEV_COMMON_H
12 #define _GNTDEV_COMMON_H
15 #include <linux/mman.h>
16 #include <linux/mmu_notifier.h>
17 #include <linux/types.h>
18 #include <xen/interface/event_channel.h>
20 struct gntdev_dmabuf_priv;
23 /* Maps with visible offsets in the file descriptor. */
24 struct list_head maps;
25 /* lock protects maps and freeable_maps. */
28 #ifdef CONFIG_XEN_GRANT_DMA_ALLOC
29 /* Device for which DMA memory is allocated. */
30 struct device *dma_dev;
33 #ifdef CONFIG_XEN_GNTDEV_DMABUF
34 struct gntdev_dmabuf_priv *dmabuf_priv;
38 struct gntdev_unmap_notify {
40 /* Address relative to the start of the gntdev_grant_map. */
45 struct gntdev_grant_map {
46 struct mmu_interval_notifier notifier;
47 struct list_head next;
48 struct vm_area_struct *vma;
53 struct gntdev_unmap_notify notify;
54 struct ioctl_gntdev_grant_ref *grants;
55 struct gnttab_map_grant_ref *map_ops;
56 struct gnttab_unmap_grant_ref *unmap_ops;
57 struct gnttab_map_grant_ref *kmap_ops;
58 struct gnttab_unmap_grant_ref *kunmap_ops;
60 unsigned long pages_vm_start;
62 #ifdef CONFIG_XEN_GRANT_DMA_ALLOC
64 * If dmabuf_vaddr is not NULL then this mapping is backed by DMA
68 struct device *dma_dev;
69 /* Flags used to create this DMA buffer: GNTDEV_DMA_FLAG_XXX. */
72 dma_addr_t dma_bus_addr;
73 /* Needed to avoid allocation in gnttab_dma_free_pages(). */
78 struct gntdev_grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count,
81 void gntdev_add_map(struct gntdev_priv *priv, struct gntdev_grant_map *add);
83 void gntdev_put_map(struct gntdev_priv *priv, struct gntdev_grant_map *map);
85 bool gntdev_test_page_count(unsigned int count);
87 int gntdev_map_grant_pages(struct gntdev_grant_map *map);